Matlab, jQuery and JSON
I do all my numerical algorithm development in Matlab, so I needed a way to easily get results from Matlab into javascript. Here is a (a pretty cool if I don’t say so myself) matlab code that creates a JSON file from a matlab data structure.
data.x = rand(10,1);
data.y = rand(10,1)
dataname = 'data'
fid = fopen('matlab.json','w');
numdata = max(size(fieldnames(eval(dataname))))
fdata = char(fieldnames(eval(dataname)));
fprintf(fid,'{ "%s" : {\n ',dataname)
for dataiter=1:numdata,
fprintf(fid,' "%s" : [ \n',fdata(dataiter));
stmp = sprintf('%s.%s',dataname,fdata(dataiter));
for i=1:(max(length(eval(stmp))))-1,
stmp = sprintf('%s.%s(%i)',dataname,fdata(dataiter),i);
fprintf(fid,'%1.10e , \n',eval(stmp));
end
stmp2 = sprintf('%s.%s',dataname,fdata(dataiter));;
stmp = sprintf('%s.%s(%i)',dataname,fdata(dataiter),(max(length(eval(stmp2)))));
fprintf(fid,'%1.10e \n',eval(stmp));
if dataiter == numdata ,
fprintf(fid,'] \n');
else
fprintf(fid,'], \n');
end
end
fprintf(fid,'} } \n');
And then reading it in and parsing it with jQuery is really simple.
var x = [];
var y = [];
$.ajaxSetup({ async: false});
$.getJSON("matlab.json", function (json)
{
x = json.data.x.slice(0);
y = json.data.y.slice(0);
}
);
